#include<bits/stdc++.h>
using namespace std;

int main(){
	cin.tie(0),ios::sync_with_stdio(false);
	string s; cin>>s;
	int n=s.size();
	vector<int>cnt(n+1,0);
	for(int i=n-1;i>=0;--i)cnt.at(i)=cnt.at(i+1)+(s.at(i)=='w');
	int64_t ans=0;
	for(int i=0;i<n;++i){
		if(s.at(i)!='c')continue;
		ans+=1L*cnt.at(i)*(cnt.at(i)-1)/2;
	}
	cout<<ans<<"\n"s;
}